package com.algernoon.nettydemo.netty1.client;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

public class TimeClientHandler extends ChannelHandlerAdapter {

	private static final Logger logger = LoggerFactory.getLogger(TimeClientHandler.class);
	
	private int counter;
	
	private byte[] req;

	public TimeClientHandler() {
		req = ("QUERY_TIME_ORDER" + System.getProperty("line.separator")).getBytes();
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
		logger.warn("unexcepted exception from downstream: {}", cause.getMessage());
		ctx.close();
	}

	/**
	 * 
	 * 当客户端和服务端链路建立成功后，Netty的NIO线程会调用该方法，发送firstMsg消息指令给服务端
	 * 
	 */
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		ByteBuf msg = null;
		for (int i = 0; i < 100; i++) {
			msg = Unpooled.buffer(req.length);
			msg.writeBytes(req);
			ctx.writeAndFlush(msg);
		}
	}

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		String body = (String) msg;
		System.out.println("Now Time is " + body + " ; the counter is " + ++counter);
	}
	
}
